Created ServersExporter test

test/servers/services/ServersExporter.test.js

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+import { ServersExporter } from '../../../src/servers/services/ServersExporter';
+import sinon from 'sinon';
+
+describe('ServersExporter', () => {
+  const createLinkMock = () => ({
+    setAttribute: sinon.fake(),
+    click: sinon.fake(),
+    style: {},
+  });
+  const createWindowMock = (isIe10 = true) => ({
+    navigator: {
+      msSaveBlob: isIe10 ? sinon.fake() : undefined,
+    },
+    document: {
+      createElement: sinon.fake.returns(createLinkMock()),
+      body: {
+        appendChild: sinon.fake(),
+        removeChild: sinon.fake(),
+      },
+    }
+  });
+  const serversServiceMock = {
+    listServers: sinon.fake.returns({
+      abc123: {
+        id: 'abc123',
+        name: 'foo',
+      },
+      def456: {
+        id: 'def456',
+        name: 'bar',
+      },
+    }),
+  };
+  const createCsvjsonMock = (throwError = false) => ({
+    toCSV: throwError ? sinon.fake.throws('') : sinon.fake.returns(''),
+  });
+
+  describe('exportServers', () => {
+    let originalConsole;
+
+    beforeEach(() => {
+      originalConsole = global.console;
+      global.console = { error: sinon.fake() };
+      global.Blob = function Blob() {};
+      global.URL = { createObjectURL: () => '' };
+      serversServiceMock.listServers.resetHistory();
+    });
+    afterEach(() => global.console = originalConsole);
+
+    it('logs an error if something fails', () => {
+      const csvjsonMock = createCsvjsonMock(true);
+      const exporter = new ServersExporter(
+        serversServiceMock,
+        createWindowMock(),
+        csvjsonMock,
+      );
+
+      exporter.exportServers();
+
+      expect(global.console.error.callCount).toEqual(1);
+      expect(csvjsonMock.toCSV.callCount).toEqual(1);
+    });
+
+    it('makes use of msSaveBlob API when available', () => {
+      const windowMock = createWindowMock();
+      const exporter = new ServersExporter(
+        serversServiceMock,
+        windowMock,
+        createCsvjsonMock(),
+      );
+
+      exporter.exportServers();
+
+      expect(serversServiceMock.listServers.callCount).toEqual(1);
+      expect(windowMock.navigator.msSaveBlob.callCount).toEqual(1);
+      expect(windowMock.document.createElement.callCount).toEqual(0);
+    });
+
+    it('makes use of download link API when available', () => {
+      const windowMock = createWindowMock(false);
+      const exporter = new ServersExporter(
+        serversServiceMock,
+        windowMock,
+        createCsvjsonMock(),
+      );
+
+      exporter.exportServers();
+
+      expect(serversServiceMock.listServers.callCount).toEqual(1);
+      expect(windowMock.document.createElement.callCount).toEqual(1);
+      expect(windowMock.document.body.appendChild.callCount).toEqual(1);
+      expect(windowMock.document.body.removeChild.callCount).toEqual(1);
+    });
+  });
+});